And no Adblue at all is better still.
I suspect that the extra hassle-factor of having to add this stuff, and the thread of the car refiusing to start if you don't, is as much a contributor to the collapse of diesel car sales as the scaremongering in the Press.
As is the availability of engines like the VAG 1.4 or 1.5 TSI petrol which can give 55 mpg on a long run, driving normally.
Adblue warning systems give about 1,500 miles notice of running out - much more than a full tank of fuel.
On a practical note, modern designs have the Adblue filler next to the diesel filler, quite convenient - but on some older designs where Adblue has been added afterwards, it may be inconveniently placed, eg under the boot floor in places.
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